package io;

import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

public class WriteStringDemo {
    public static void main(String[] args) throws IOException {
        FileOutputStream fos=new FileOutputStream("book.txt");
        String str="123123123123";
        byte[]data=str.getBytes(StandardCharsets.UTF_8);
        fos.write(data);
        fos.close();
    }
}
